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<p>任何一个好的后端开发都应该懂点前端知识<br>– 沃兹基梭得</p>
</blockquote>
<p>从第一次接触Java，就是用Java来做一个坦克大战，再到后来的用Weex来做毕业设计，还有平时经常玩的游戏。前端永远是用户第一时间感受到的，所以哪怕是10ms的差距，都是有必要减少的。    另外，良好的动画效果也能带给使用者“美”的感受。</p>
<p>因为换了部门需要自己来写JQuery，虽然对于别人来说是一件退后的事，但是不妨让我更加深入地来理解前端。</p>
<a id="more"></a>

<h2 id="Vue-js-和-JQuery"><a href="#Vue-js-和-JQuery" class="headerlink" title="Vue.js 和 JQuery"></a>Vue.js 和 JQuery</h2><p>令我尤为蛋疼的是，JQuery都是通过元素去绑定函数，被绑定的元素发生了变化，类似如果多个元素同名或者是元素重合，会导致一些函数不生效。而且随着时间的发展，代码也会越来越臃肿。</p>
<p>而Vue.js或者是React.js就抽象的比较高层，都是用对象（数据）来驱动DOM节点，数据的变化带来了DOM节点的变化。这样更有利于代码的解耦，以及可维护。两者不同的是，Vue设计的更加简单，类似于可变模型，而React类似于不可变模型。类似于Java的并发模型的设计，无所谓哪个好那个坏，只是在某些场景下，某种方式更有效。</p>
<p>作为一个后端，我还google了一下，是否能多线程来渲染DOM节点，毕竟现在电脑的能力永远是up up up的，最后发现不行。</p>
<h2 id="Js-和-Java-的区别"><a href="#Js-和-Java-的区别" class="headerlink" title="Js 和 Java 的区别"></a>Js 和 Java 的区别</h2><p>这个问题看上去好像是新手问的问题，但是仔细思考一下你会发现不是的。在写Js的时候，作为一个后端开发，第一反应就是能不能封装一个对象，我只要操作这个对象就能做到内容的修改。    去研究了下Js的设计思路，</p>
<p><a href="http://www.ruanyifeng.com/blog/2011/06/designing_ideas_of_inheritance_mechanism_in_javascript.html">http://www.ruanyifeng.com/blog/2011/06/designing_ideas_of_inheritance_mechanism_in_javascript.html</a></p>
<p>Js之所以叫JavaScript确实是借鉴了Java对于“对象”的设计，但是作者又不想太正式，并没有设计“类”这个概念。因此，Js是没有“继承”这个概念的。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Dog dog = <span class="keyword">new</span> Dog();</span><br></pre></td></tr></table></figure>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> dog = <span class="keyword">new</span> Dog(<span class="string">&#x27;阿黄&#x27;</span>);</span><br></pre></td></tr></table></figure>
<p>js new后面的其实是一个构造函数。如果需要从同一个对象中来实现子对象，Js使用的是prototype的方式。</p>
<h2 id="ES6"><a href="#ES6" class="headerlink" title="ES6"></a>ES6</h2><p>和Java一样，每一个版本的语言都会释放很多有意思的API。ES6作为一个现在前端主要使用的版本，虽然看不太懂，但是感觉很流弊的样子。</p>
<h2 id="最最重要的-–-gt-浏览器的渲染引擎"><a href="#最最重要的-–-gt-浏览器的渲染引擎" class="headerlink" title="最最重要的 –&gt; 浏览器的渲染引擎"></a>最最重要的 –&gt; 浏览器的渲染引擎</h2><p>从最简单的网页，到现在的无比复杂的页面。我们都是在HTML、CSS、JS中渡过，然而我始终没明白，浏览器是如何解析的。</p>
<p>看了这边文章，终于算是明白了：<br><a href="https://segmentfault.com/a/1190000017872125#articleHeader0">https://segmentfault.com/a/1190000017872125#articleHeader0</a></p>
<p>所有的渲染都是由渲染引擎来处理的，和Js引擎没有关系。<br>Rendering engines 渲染引擎</p>
<ul>
<li>Gecko</li>
<li>Webkit</li>
<li>Blink</li>
</ul>
<p>这些都是浏览器所选的渲染引擎，从上到下分别为firefox、safari、chrome。</p>
<ol>
<li>首先将HTML解析成为DOM树</li>
<li>将CSS挂载到DOM树上</li>
<li>触发渲染引擎的paint()函数，来进行全局或者增量绘画</li>
</ol>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">link</span> <span class="attr">rel</span>=<span class="string">&quot;stylesheet&quot;</span> <span class="attr">type</span>=<span class="string">&quot;text/css&quot;</span> <span class="attr">href</span>=<span class="string">&quot;theme.css&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">p</span>&gt;</span> Hello, <span class="tag">&lt;<span class="name">span</span>&gt;</span> friend! <span class="tag">&lt;/<span class="name">span</span>&gt;</span> <span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span>&gt;</span> </span><br><span class="line">      <span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;smiley.gif&quot;</span> <span class="attr">alt</span>=<span class="string">&quot;Smiley face&quot;</span> <span class="attr">height</span>=<span class="string">&quot;42&quot;</span> <span class="attr">width</span>=<span class="string">&quot;42&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<img src="https://image-static.segmentfault.com/309/094/3090942167-5ad7d7a47f751_articlex" width="60%" height="60%" alt="DOM树"/>

<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">body &#123; </span><br><span class="line">  font-size: 16px;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">p &#123; </span><br><span class="line">  font-weight: bold; </span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">span &#123; </span><br><span class="line">  color: red; </span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">p span &#123; </span><br><span class="line">  display: none; </span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">img &#123; </span><br><span class="line">  float: right; </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<img src="https://image-static.segmentfault.com/418/872/418872208-5ad85a624be05_articlex" width="70%" height="70%" alt="CSSOM"/>

<h2 id="Js能否代替Java？"><a href="#Js能否代替Java？" class="headerlink" title="Js能否代替Java？"></a>Js能否代替Java？</h2><p>对于一个日常开发Java的我来说，看到任何一门语言我都在思考他是否能够代替Java。</p>
<p>Java最大的特性在与它对于面向对象的设计，无论是泛型，还是继承，多态，封装，甚至是反射。这些无疑是搭建一个很复杂的软件工程所需要的。当然，前提是有一个好的架构师，否则最终永远是在填坑。</p>
<p>另外，时间的积累对于Java而言也是友好的，无论是Maven的体系，还是GC算法的迭代，还有那么多的类库的支持。让更多用户上手的第一选择就是Java。因此，任何一门新生语言类似Go，想在短时间内超过Java还是比较难的。</p>
<p>Java的缺点，线程模型的设计并不是那么的优秀。和Go以及Node.js一比，你会发现开发需要投入成本来关注线程的切换，以及线程安全的问题。</p>
<p>对于函数式编程并没有那么好的支持。</p>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>无论使用什么语言，终究是一层壳，需要更多关注的是壳里面的本质，无论是操作系统内核还是浏览器内核。</p>
<p>更多的思考，带来更深入得理解。</p>

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